Poly Rear Sub Frame Bushes

[Dazmans12]

I do have a complete car I will be breaking at some point this yr, when I get a chance, Was planning on using that subframe as a templete. Looking at your link, Northerner has it sorted. it looks like the Z31s are a straight fit, & with out leaving the old bush coller in.
Are the other bushes a straight fit, or do we need to keep the old metal coller in once the rubbers been burnt out.